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GPT-5.1 vs Solar Pro 3

OpenAI vs Upstage — benchmarks, pricing, and capabilities side by side.

  • GPT-5.1 has the higher intelligence index (89 vs 72.4)
  • Solar Pro 3 is cheaper ($0.15 vs $1.25 per 1M input)
  • GPT-5.1 has a larger context window (400K)
GPT-5.1Solar Pro 3
Intelligence index8972.4
DeveloperOpenAIUpstage
TypeLLMLLM
AccessAPI onlyAPI only
Context window400,000 tokens128,000 tokens
Input price$1.25 / 1M$0.15 / 1M
Output price$10.00 / 1M$0.60 / 1M
Speed115 tok/s
ReleasedNovember 12, 2025January 27, 2026
Parameters
Input modalitiesText, ImageText
Output modalitiesTextText

Shared benchmarks

GPT-5.1
Solar Pro 3
GPQA Diamond
88.1
72.4
Humanity’s Last Exam
26.5
10.1